The isn't just a price guide; it is the 45th chapter in a massive, nearly 50-year-long project to index every machine-struck coin on the planet. Often called the "Krause Catalog" or the "Big Blue Book," it represents a worldwide effort by over 100 experts to track the physical remnants of the 20th century's most turbulent history. The Legacy of Krause and Mishler

: Features universally recognized Krause-Mishler (KM) numbers, which are the industry standard for cataloging world coins. Metal Content

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The universal numbering system used worldwide to catalog specific coin types.

: Listings use the universally recognized KM reference numbers , making it easy for collectors to communicate with dealers and other hobbyists.